Diving mask



FIG. 1 is a front, right side perspective view of a diving mask showing my new design;

FIG. 2 is a rear, right side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof, the left side elevation view being a mirror image of the right side elevation view;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines depict portions of the diving mask that form no part of the claimed design. 

CLAIM The ornamental design for a diving mask, as shown and described. 